Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)

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Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Tax benefit at federal statutory rate (34.00%) (34.00%)
State income taxes, net of federal benefit (4.00%) (4.00%)
Permanent differences 26.60% 1.20%
Other 0.00% (0.40%)
Change in effective rate 16.70% 0.00%
Change in valuation allowance (5.30%) 37.20%
Effective income tax rate 0.00% 0.00%